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(126 Pages of Text + Exhibits)

In accordance with a Directive to Take Corrective Action in
Response to an Underground Storage Tank Release issued by the California
Regional Water Quality Control Board pursuant to California Health & Safety
Code Section 25296.10 and 23 Cal. Code Regs. Sections 2720-2727, the
Responsible Party in a soil and groundwater contamination case at a former
gasoline service station site conducted a feasibility study to evaluate the
simultaneous vacuum extraction of contaminants from soil and extraction of
groundwater as a remedy to actual or potential adverse effects of an
unauthorized release. Dual Phase Extraction was deemed necessary since the
majority of soil impacted by contaminant was located at the capillary
fringe at or below the water table. Groundwater extraction (pumping) to
drawdown the water table was required to expose the impacted soil column
and accommodate vapor extraction of soil contaminants.

This Report describes the results of a Dual Phase Extraction
Pilot Study which was conducted to determine whether Dual Phase Extraction
could accomplish removal of contaminant mass from soil and groundwater at
sufficient rates, such that if carried out over a longer time period
pursuant to an approved Remedial Action Plan, promulgated target cleanup
goals could be achieved. Parameters evaluated in this study to determine
the viability of Dual Phase Extraction as a primary remedial method include
extent and sustainability of groundwater drawdown, efficiency of
hydrocarbon removal rates in vapor and liquid phases during DPE, and radius
of influence at the subject site as determined from DPE data.